Check out these tutorials.
In particular the 2nd one. I'm guessing you made your model with separate materials and primatives in blender -and exported them as a group. Rather then grouping and uv unwrapping. Then with single texture you can import the .png image and apply to the swords shader.

So that second tutorial looks like it would work if I wanted to create the materials/textures myself, but I already have them downloaded from http://matrep.parastudios.de/ , would there be a way to export these textures on the object without recreating them myself somehow?